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虽然在热模锻曲柄压力机上采用闭式模锻造有可能节约金属材料,但是这种工艺过程暂时还得不到广泛的应用。其主要原因是:在大批量生产中获得重量精确的原始毛坯很复杂;现有的模具装备结构不完善。本文研究使用一般精度的毛坯闭式模锻的工艺过程。所采用的闭式模具的结构很复杂,这是因为在模锻长度及直径为正公差的原始毛坯时,必须补偿模锻终了时多余的金属。如果闭式模具没有补偿器或补偿器不完善,都将导致锻件的端部产生飞边。在凸凹模之间产生端部飞边的原因是,模具的上、下型腔不能均匀充满。下面假定,
Although the use of closed die forging in hot die forging presses is likely to save metal, this process is not yet available for a while. The main reason is: in the mass production to obtain accurate weight of the original rough is very complex; the existing mold and die structure is not perfect. This paper studies the process of closed-die forging using general precision. The structure of the closed mold used is complicated because it is necessary to compensate for the excess metal at the end of forging when the original blank of length and diameter are positive forgings. If the closed mold without compensator or compensator is not perfect, will lead to forging the end of the flash. The reason for producing the end flash between the punch and die is that the upper and lower mold cavities can not be uniformly filled. Assuming below,